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Note 9 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2026
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2026

   

2025

 
                 

Stock options to purchase common stock

    505,010       168,184  

Common stock warrants

    7,877,514       2,467,104  

Total

    8,382,524       2,635,288